diff --git a/mfbt/ThreadSafety.h b/mfbt/ThreadSafety.h
index f1382643e1a9..9b18c71bd039 100644
--- a/mfbt/ThreadSafety.h
+++ b/mfbt/ThreadSafety.h
@@ -22,7 +22,7 @@
 #define mozilla_ThreadSafety_h
 #include "mozilla/Attributes.h"
 
-#if defined(__clang__) && (__clang_major__ >= 8) && !defined(SWIG)
+#if defined(__clang__) && (__clang_major__ >= 11) && !defined(SWIG)
 #  define MOZ_THREAD_ANNOTATION_ATTRIBUTE__(x) __attribute__((x))
 // Allow for localized suppression of thread-safety warnings; finer-grained
 // than MOZ_NO_THREAD_SAFETY_ANALYSIS